In the era of the Big Four, the U.S. impatiently awaits its next big star

BY HARVEY ARATONSPORTS

The very tall man was at the net, about to smash a ball past Frances Tiafoe and possibly through the corporate signage on the back wall of the new Grandstand court.
John Isner, all 6 feet 10 inches of him, pounded an overhead smash straight at the 6-2...